Re: Simple Response.
I don't think it was official WH docs, it was ruled that he can't block people because he is the president and doing so would be blocking free speech. 'His' argument was it is a personal account. It was ruled that as long as he is the president and is posting anything political anyone can comment on it, just as they can do in real life.
I don't think Twitter can't be held to have to archive government documents, if they are classed as that, that's the WH job. There is the trump twitter archive.